Humanity has achieved so much progress, has solved so many problems,
avoided so many dangers, and yet we now face the most colossal problem
in the entire human history and evolution, namely that industry,
technology, commerce, transport, overpopulation and overconsumption
might destroy the very essence and future of the Earth, including our
own, namely its nature.

We need innumerable great and small ideas and efforts to countervail that.

Robert's The Miracle, Joy
and Art of Living,Volume II Chapter 4 - Of
Positive LivingThe brain needs positive stimuli to be a well-functioning central command unit for the entire being.